Seal-press.



R. A. STEWART.

SEAL PRESS. APPLIUATIOH Hum Nov. 25. 1910.

989,078. Patentd Apr. 11, 1911.'

muy

UNTTED sTATEs PATENT oEEIoE.

lROBERT ALEXANDER STEWART, OF MUSKEGON, MICHIGAN, ASSIGNOR '10 HILL- p INDEPENDENT MFG. CO., OF MUSKEGON, MICHIGAN, A CORPORATION OF ILLINOIS.

SEAL-PRESS.

Specification of Letters Patent.

Patented Apr. 11, 1911.

Application filed November 25, 1910. Serial No. 594,145.

To all 'whom 'it may concem:

Be it known that I, ROBERT ALEXANDER STEWART, a citizen of the United States, and a resident of Muskegon, in the county of Muskegon and State of Michigan, have invented certain new and useful Improvements in Seal-Presses, of which the following is a speciication.

This invention relates to improvements in seal presses and it is the object of my invention to provide a press of very simple lines, of exceedingly great strength, and one which is not only unlikely to get out of order but which is as nearly dust proof as it is possible to make one. To this end I employ a main frame having a bifurcated lever pivotcd to it and connect this lever to a plunger working within an aperture or, in its preferable embodiment, a through bore and form the plunger with an offset with which co-acts a spring to normally hold said plunger in its upper position; a concealed pivoted latch being also preferably provided to lock the bifurcated handlein its lower position, against the tension of its spring, when desired.

With these objects in view, my invention consists'in the seal press as shown in its preferable embodiment in the accompanying drawings and as will be hereinafter described.

Referring to the drawings: Figure 1 is a perspective view of a seal press constructed in accordance with my invention. Fig. 2 is aside elevation of the same, partly in vertical section. Fig. 3 is a perspective detail of several parts. Fig. 4 is a view, similar to Fig. 2, of part of the main frame.

Referring now to the details of the drawings by numerals: 1 designates a U-shaped frame provided with a handle 2 at its rear end and with a seat 4 for the lower die at one extremity of the U and a member 6 atthe other extremity of the U having a through bore 8 and a pocket 10 for a spring to be hereinafter described. Within the through bore 8 is slidingly placed a cylindrical plunger 12 which accurately fits the through bore and slides up and down therein with little friction and with absolutely no lateral movement. This cylindrical plunger 12 is provided with an offset 14 which projects over and closes the upper end of the pocket 10 as indicated in Fig. 1. Not only does the olset 14 close the pocket 10, but it also serves its main function of co-acting with a spring 16 located within the pocket 10, whereby the plunger is normally held in its upper position as shown in Figs. 1 and 2.

To the lower end of the cylindrical plunger 12 I secure the upper die 18, said die having a screw threaded part 20 entering a screw threaded opening within the lower end of the cylindrical plunger 12. The said cylindrical plunger also has two screws 21 and 22 screwed therein from opposite sides and these screws form pivots which pass through the lower ends of a pair of links 24 and 26. The upper ends of these links are pivoted to a simple lever 30, the end of which is bifurcated and straddles the upper part of the member 6, the bifurcated ends 32 and 34 being pivoted to an offset 36, a pivot pin 38 passing through said bifurcated ends and through said offset as clearly illustrated in Fig. 1. The aforesaid links 26 are formed of the shape shown in Fig. 3, and are therefore double and connected together by means of a web 27 which not only serves to connect the double links but also greatly strengthens the links and almost makes them of the strength of a piece of U-shaped channel iron. The lower end of the member 6 of the main frame is provided with slots or openings 39 to permit the pins or pivots 20 and 22 to move partially into the same, as the die moves to its upper position.

In order to form a stop for the movement of the die, the handle 30 is so formed that it contacts with the upper end of the member 1 at the point marked 40 in Fig. 2.

In order to lock the parts in position whereby they may be carried in ones pocket or otherwise, I slot the main frame 1 as indicated at 42 and pivot therein a latch 44 on the pivot 46, and the handle 30 is provided with a slot 50V so that when the handle is depressed, the lever will pass down over the latch 44 when the operator may move the latch 44 so that its projection 52 moves over the handle 30 and locks the same in its lower position.

The use of seal presses is so well known that a description of the use of the same is believed to be unnecessary yet, I would point out the fact that my seal press is exceedingly compact, very simple and of the greatest strength.

While I do not limit my invention to a frame having a through bore, it is obvious that there are advantages in the use of such a structure as that shown in the drawings for the reason that the cylindrical plunger 12 accurately fits its through bore and inasmuch as the offset 14: also accurately iits t-he opening for the spring 16, the cylindrical plunger is not only prevented from any lateral movement which would permit the upper die to getout of registry with the lower die, but also from any movement on the axis of the cylindrical plunger 12.

I am aware that a bifurcated lever has het'ore been proposed and also that a plunger of the kind illustrated is not in itself new, but I `believe I am the first one to combine these together and use a simple link connecting the simple lever 30 with the plunger whereby power is transferred from the operating lever 30 in substantially a direct straight line to the plunger supporting the upper die. I deem this of importance.

What I claim as my invention is:

1. In a seal press, the combination of a frame formed of two members, one of said members having openings therein and provided with a fixed handle, a plunger working in one of said openings and having an off-set projecting into the other opening, a spring within'the second opening co-acting with said oE-set, a bifurcat-ed handle working in coperative relation with said fixed handle, said bifurcated handle straddling the part of the frame containing the plunger and having its free ends pivoted to said frame at a point to one side of the axis of said plunger, and links on opposite sides of the frame connecting the bifurcated parts of the handle with said plunger, whereby the movement of the pivoted handle toward the fixed handle applies power through said links to said plunger substantially directly in line with the movement of said plunger, substantially as described.

2. In a seal press, the combination of a frame having a plunger working therein and formed with a xed handle projecting to one side thereof, a die carried by said plunger, and a bifurcated lever pivoted to the frame carrying the plunger and straddling the same and projecting over the fixed handle, said frame having a slot therein located close to that part of theA frame containing the plunger and under the part of the pivoted lever which projects over the fixed handle, and a pivoted latch working in said slot and co-acting with the bifurcated handle near the point where it straddles the frame, substantially as described.

3. In a seal press, the combination of a frame formed of two members, one of said members having openings therein and provided with a lixed handle, a plunger work ing in one of said openings and having an off-set projecting into the other opening, a spring within the second opening cov-,acting with said off-set, a pivoted bifurcated handle working in coperative relation with said fixed handle and straddling-the part of the frame containing said plunger, and links connecting the bifurcated ends of said pivoted handle with said plunger, each of said links being doubled andV connected to its lever on opposite sides of the same, substantially as described.

4. In a seal press, the combination of a frame formed of two members, one of said members having openings therein and provided with a fixed handle, a plunger working` in one of said openings and having an off-set projecting into the other opening, a spring within the second opening co-acting with said off-set, a pivoted bifurcated handle working in coperative relation with said fixed handle and straddling Vthe part of the j.

frame containing said plunger, and links connecting the bifurcated ends of said pivoted handle with said plunger, each of said links being double and formed of one piece of material and having the end of the lever f between its doubled parts, substantially as described.

Signed by me at New York city this 21st day of November 1910.

ROBERT ALEXANDER STEWART. Illitnesses 1 GEO. T. HOLIHAN, Louis C. KELTING.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

